package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    /**
     * 新增菜品和对应的口味
     */
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    @Transactional//开启事务管理，要么全成功，要么全失败，保证数据一致性（同时还要在程序启动项最上方加入一个注解)
    public void saveWithFlavor(DishDTO dishDTO) {
       Dish dish=new Dish();
       BeanUtils.copyProperties(dishDTO,dish);
        //向菜品中插入1条数据
        dishMapper.insert(dish);
        //获取insert语句生成的主键值
        Long dishId=dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!=null && flavors.size()>0){
           flavors.forEach(dishFlavor->{
               dishFlavor.setDishId(dishId);
           });
        }
        //向口味表中插入n条数据
        dishFlavorMapper.insertBatch(flavors);
    }

    /**
     *菜品分页查询
     */
    @Override
    public PageResult pageQUery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }
/**
 * 批量删除菜品
 */
//涉及多表查询，所以要添加事务
@Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除--是否存在起售中的
        for(Long id :ids){
            Dish dish=dishMapper.getById(id);
            if(dish.getStatus()== StatusConstant.ENABLE){
                //如果status=1表明菜品在起售中，不能删除--抛异常
                throw new DeletionNotAllowedException((MessageConstant.DISH_ON_SALE));
            }
        }
        //判断当前菜品是否能够删除--是否被套餐关联
        List <Long> setmealIds=setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds!=null && setmealIds.size()>0){
            //当前菜品被套餐关联，不能删除--抛异常
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
//        //删除菜品数据
//          for(Long id:ids){
//              dishMapper.deleteById(id);
//              //删除菜品关联的口味数据
//              dishFlavorMapper.deleteByDishId(id);
//          }
    //优化：批量一次性删除，而不是批量逐个遍历删除
    //批量删除菜品数据
    dishMapper.deleteByIds(ids);
    //批量删除菜品口味数据
    dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     *根据id查询对应的菜品和口味信息
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询对应的菜品信息
        Dish dish=dishMapper.getById(id);
        //根据菜品id查询对应的口味信息
        List<DishFlavor> dishFlavors=dishFlavorMapper.getByDishId(id);
        //将查询到的菜品信息以及口味信息封装到DishVO里面并返回
        DishVO dishVO=new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }
    /**
     *根据id修改菜品的基本信息以及口味信息
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品的基本信息
        dishMapper.update(dish);
        //删除原有口味的基本信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!=null && flavors.size()>0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 菜品起售停售
     *
     * @param status
     * @param id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }
}
